Quadruplex-telegraph system.



C. G ASHLEY. QUADRUPLEX TELEGRAPH SYSTEM. APPLICATION FILED OCT. 8. 1915.

Patented J uly 24, 1917.

IINITED %TATE% BATEN T rmcn CHARLES G. ASHLEY, OF TORONTO, ONTARIO, CANADA, ASSIGNOR TO GENERAL ENGINEERING AND CONSTRUCTION COMPANY, LIMITED, OF TORONTO, ONTARIO. CANADA, A CORPORATION OF ONTARIO.

QUADBUPLEX-TELEGBAPH SYSTEM.

Application filed October 8, 1915.

To all whom it may concern Be it known that I, CHARLES Gr. AsHLnY, a citizen of the United States of America, and a resident of the city of Toronto, county of York, and Province of Ontario, Canada, have invented a new and useful Improvement in Quadruplex-Telegraph Systems, of which the following is a specification.

My invention relates to multiplex telegraphy and pertains especially to those systems of multiplex telegraphy which from their limitations and methods of operation are termed quadruplex systems.

The principal obj ectsof my invention are to produce a quadruplex system of telegraphy of great simplicity and ruggedness.

I accomplish these and other desirable features which will be hereinafter more fully pointed out and discussed by a novel arrangement of apparatus and system of circuits which allows the elimination of delicate relays and in which the line impulses are directly utilized to operate simple and rugged receiving apparatus.

In the drawing which accompanies and forms a part of this specification I have illustrated one embodiment of my improved quadruplex system, and for the purposes of clearness I have illustrated only half of the circuit, as I deem it well understood in the art that the other half of a quadruplex circuit is exactly similar and its illustration is eliminated as unnecessarily complicating the drawing.

In the drawing I have illustrated on the left the transmitting portion of a station, and upon the right the receiving portion of a station.

The transmitter comprises an alternating current motor 26 connected through leads 27 and 28 with any source of alternating current. The motor bears loosely sleeved upon its shaft 10 a ratchet wheel 11 and commutator 18, which is rigidly attached to the ratchet wheel. The ratchet wheel 11 and commutator 18 are connected to the shaft 10 by a spring 19 and are rotated by the motor 26 and said spring connection. Thus the motor is simply a means of winding the spring 19 and storing energy therein to rotate the ratchet wheel and commutator, and the motor, as far as driving is Specification of Letters Patent.

Patented July 241, 1917..

Serial No. 54,767.

concerned, may be operated either by direct or alternating current.

The armature 20 is pivoted by a pivot 21 in a slot through the permanent magnet 22 and is inclosed for a portion of its length by a coil 23, which is connected to a supply of alternating current. The extremity of the armature 20, which extends above a polarizing magnet 22 bears a pair of detent pawls, the relation of which to the ratchet wheel 11 is such that each vibration of the armature 20 releases the ratchet wheel 11 and allows the commutator 18 to rotate a distance equal to half of the angular distance between any two teeth of the ratchet wheel 11. The coil 23 when energized by alternating current causes the armature 20 to vibrate in synchronism with the operating current and releases the ratchet wheel to rotate in step with the alternations of the current.

The transformer 2524 is connected through its primary 25 with the same source of alternating current that energizes the coil 23 and induces current in its secondary which is of the same frequency as the ratchet operating current. The secondary 24 of the transformer is grounded at one terminal and its other terminal is connected to a brush 12 which bears on and makes contact with a ring 17 on commutator 18. This ring 17 is connected electrically with rows of commutator bars 16 and 15. These commutator bars or segments are so placed with relation to the ratchet wheel 11 and brushes 13 and 14- and are further so spaced with relation to each other that brush 13 makes contact with a segment of the row of segments 16 at such time when say a positive wave of current is being generated in the secondary 24 while brush 14: is out of contact with the rows of segments 15 at such time and is in contact with a segment of the row of segments 15 only at that time when a negative wave of current is bein generated in the secondary 2 1. Each hal f vibration of the armature 20 releases the ratchet wheel 11 to allow alternate contacts to be made between the brushes 13 and 14 with their respective rows of segments as 15 and 16, thus as the ratchet wheel and commutator rotate in step with the current induced in the secondary 24, and as this current through brush 12 is in communlcation with the rows of segments 15 and 16 it follows that brushes 18 and 141 are continuously and successively enlivened each with a definite sign of potential, thus brush 13 is continuously enlivened with positive potential, while brush 1a is similarly enlivened with negative potential. A manual Morse key 3 0 is connected in series with brush 13 and through resistance 32 with the line wire 34:, and through an equal resistance 33 conductor 71 with an adjustable artificial line 7 2. Key 31 is inserted between the same line organization and brush 14c.

The transmitter therefore comprises a means for segregating the variant potentials in an alternating current and the keys constitute means for manually interrupting separately either of these segregated poten tials.

The receiving apparatus shown on the right of the figure comprises two polarized tape printing devices connected in series. These devices comprise a substantially circular polarizing magnet 58 and an electromagnet 60 which is supported by one extremity of the polarizing magnet 58 by means of a non magnetic apron 57. A bell crank shaped armature 59 is pivoted in a slotted non magnetic support 62 and is normally maintained, by reason of the permanent magnetism of the polarizing magnet 58, with its printing type 64: out of contact with a receiving tape 57. It will be readily observed that if the electromagnet 60 is enlivened with current of one potential that it will attract the upper portion of armature 59 to cause the printing portion of the armature 64 to strike a blow upon the impression paper 69 which is superimposed upon a receiving tape 67 which is carried by suitable power from a reel 68 over an anvil 65 and thus an imprint will be made on the paper 67. We will suppose that the permanent magnet 58 is polarized as indicated by the letter on its extremity, and that the winding of the magnet 60 is such that positive current moves the armature 59 to record an impression upon a tape 67. WVe will further suppose that polarizing magnet 38 of the other receiving device is polarized as indicated by the letter on its free extremity and that the magnet 40 is so wound that negative current is required to move the armature 39 to cause the printing member 44: through the medium of the impression paper 49 and anvil 45 to record an impression upon the tape 17. Thus if the tapes 67 and 47 be drawn in the direction as indicated by the arrows on the reels 68 and 4:8, by any suitable means and at uniform predetermined speed and an alternating current of say 60 cycle be impressed upon magnets 60 and 40, then if the speed is proper a continuous and unbroken horizontal line will be imprinted upon the tapes 67 and 47. However, if this alternating current be interrupted in accordance with the Morse code the resultant record upon tapes 67 and 47 will be readable as that code. Consequently as a series of positive impulses may be placed upon line 3% and through the receiving devices as 61 and tl of a receiving station, it follows that this series of positive impulses will operate only one of the receiving devices as say 61, and that it may be interrupted on the key 31, manually, to record readable Morse characters. Likewise readable Morse characters may be recorded by the receiving device 11 by the use of in terrupted series of negative potentials through the medium of 'key 30. The use of the resistances 32 and 38 together with the use of the adjustable artificial line 72 is well known in the art, and explanation of their functions is deemed unnecessary.

As further increasing the efficiency of my system I include a curb currentwhich is supplied at all times to the line from the secondary of the transformer 24 through a re sistance 29 which results in placing upon the line an alternating current of the same frequency and in phase with the operating impulses, but of such energy as not to operate the receiving devices 61 and 411. This curb current scavenges the line and increases the speed of operation through elimination of electrostatic effects. 7

It will be noted from the foregoing that 100 I have greatly simplified the quadruplex systems as hitherto known and through such simplification have provided a system of rugged organization and one that possesses attributes tending toward infallibility of 105 operation.

lVhile I have illustrated but one embodiment of my device it is obvious that numerous changes may be made in the details thereof without departing from the spirit 110 or narrowing the scope of my invention.

Having thus described my invention what I claim as new and desire to secure by United States Letters Patent is as follows 1. In a quadruplex telegraph system, a 115 source of alternating current, a transformer, the primary of which is connected to said source, means in circuit with the secondary of said transformer for segregating the variant potentials of the alternating current 120 induced in the secondary of said transformer, means for manually interrupting each of the variant potentials separately to form separate codes and means for separately receiving said codes.

2. In a quadruplex telegraph system, an inductively derived source of alternating current, means for segregating the two potentials of said alternating current, means for manually interrupting each of the two 130 potentials separately to form separate codes and means for separately receiving said codes.

3. In a quadruplex telegraph system, a source of alternating current, a transformer connected thereto, means for segregating the variant potentials of the alternating current produced in the secondary of said transformer, means for manually interrupting each of the variant potentials separately to form separate codes, and means for separately receiving said codes.

4. In a quadruplex telegraph system, a source of alternating current, a transformer connected thereto, a commutator operated Copies of this patent may be obtained for five cents each, by addressing the Commissioner from said source and in circuit with the secondary of said transformer for segregating the variant potentials produced in the secondary of said transformer, means for manually interrupting each segregated potential separately to form separate codes, and means for separately receiving said codes.

Signed by me at Toronto, county of York, and Province of Ontario, this 6th day of October, 1914.

CHARLES G. ASHLEY.

Witnesses L. NnWsoME, A. SINCLAIR.

of Patents,

Washington, D. 0. 

